The Nikto creatures do not use the textures from the swoop riders, they are separate Same for the swoop bike textures, they are separate from the ones from the placeables. "LTS" tag refers to Taris textures, which are part of the model geometry. The riders are from the level geometry and have nothing to do with creatures or appearance.2da. Same for the bikes, they have nothing to do with placeable.2da.
It'd be great to have the K2 swoop displayed, but i don't know how to create lightmaps for models that do not have them by default. That's why I used the swoop bike from the Ebon Hawk there. I didnt play K2 so much, if you happend to know if there is a place in TSL where the swoop bike is displayed, i can reuse the model and the lightmap. Otherwise, I can't introduce it atm, my skills are still kinda limited ^^